Hadoop 2.9.0 release

Release candidate - 3.0.0-RC0

Release candidate - 2.9.0-RC3

Release candidate - 2.9.0-RC2

Release candidate - 2.9.0-RC1

Release candidate - 2.9.0-RC0

Hadoop 2.8.2 release

Release candidate - 2.8.2-RC1

Fix javac, javadoc and checkstyle issues before branch-2 merge.

YARN-7063. TestTimelineReaderWebServicesHBaseStorage fails with NoCla…

…ssDefFoundError on TSv2 branch2. (Varun Saxena via Haibo Chen)